The biggest resort in Alaska is Alyeska. http://www.alyeskaresort.com/

I've never skiied there, but it looks like a pretty cool mountain and gets a TON of snow. Powder!!! It also looks really really cold if you go in the middle of winter. There are a few Heli operations, probably the two most popular are Chugach powder guides and Points North. No matter where you go, I think weather will play a big roll. I've heard stories of white out conditions lasting for periods of a week or longer. Either way, Sounds like it could be a pretty epic trip.